Car-ventilator.



' T.. PAT TISONF CAR VENTILATOR.

APPLICATION'FILED APR-12.1915.

1,205,475. I Patented Nov. 21, 1916.

I IN VEN TOR, 1 Thomas Pafial'son,

A TTORNE Y THOMAS PATTISON, OF SANTA CLARA, CALIFORNIA.

CAR VENTILATOR.

Specification of Letters Patent.

Patented Nov. 21, 1916.

Application filed April 12. 1915. E ieri h1 N0.20,712.

To all. whom it may cont-cm Be it known that I, Tiioius lhvririsox, a citizen ofthemUnited States, residing at- Sunnyvale, inthe county of; Santa Clara and State of California, have inventednew and useful lin 'n'ovenientsin. Car-Ventilators. or which the following is a specification.

Theobject of the present invention is to provide an improved ventilator .lor street and railroad cars.-

In the accompanying drawing, Figure l is a frontview of the ventilator .in position on a car, part of the roof of the car being shown in section; Fig. 2- is a longitudinal section of the same on the line E22 oi Fig. 1; Fig. dis a longitudinal section of a portion of the ventilator; Fig. i is an end view of an upper portion of the ventilator.

Referring to the drawing,- 1 indicates the roof :of a car, into a. rectangular hole in which are inserted, with a snug lit, side walls 2 and end walls 3 depending from the central portion of the lower section i of. my improved ventilator, which lower section thus forms a rectangular fine or chimney and may be termed the ventilator proper, the upper section being merely the protecting hood or cover therefor. Said side walls 2 have near the top two long, narrow horizontally extending holes 5. and with each side wall are connected, on opposite sides of the hole 5 therein, downwardly and outwardly extending oblique walls 6, 7 diverging from each other outward, the slope of the lower portions of said walls being considerably less than that of their upper portions. The ends of said walls are ein'mected to the edges of extensions 8 of the end walls 3, said walls 6, 7 thus forming, with said extensions, on each side of the flue or chimney, a chamber or conduit 9 having a Wide lower open end and a narrow upper open end. Each conduit is divided midway. into compartments hy a partition 11, which has the same general direction as the upperan'd lower walls 6, 7 of the conduit. Since the lower open ends of these chambers face to the front and rear of the car respectively, it follows that, when the car is in motion, air is pressed into the forward conduit 9 with a force corresponding to the speed of the car, and, by reason of the walls 6, 11 and 7 of the conduit converging, the pressure of the ann J entering said conduit 9 gradually lI'lClft'tlStS, so that the :l1l' 1SSuQ$ from the upper narrow open end oi. the conduit with great. velocity. -This .narrow stream of air, direl-ted upward with great velocity in the vertical line or chinmey r, has the eliect of creating an upward draft in said fine, and of thus drawing oli' and expelling the air vi'roui the top of the interior of the car.

I also provide a vertical partition 10 mid way between the two side walls '2 of the lower section, the ends oi which are secured to the end walls 3 of said section. partition serves a very important purpose, for, but for the partition. the stream of air flowing with great velocity through the conduits on one side and leading to the points immediately above the inlet mouths of the conduits i-l on the other side would produce an upward suction in said latter conduits, and thereby a considerable portion of the energy of said streams ot' a-ir would be used without performing useful \vorkin drawing the air upward through the ventilator flue. By inter-posing the partition 10. which prevents said. streams of air reaching the inlet mouths of the opposite .oond'uits 9, this resultis avoided.

1: also provide improved means for preventing rain, leet or snow froin entering the cal through said flue 4. For this purpose there is provided a eonuniratively large horizontally extending open-ended pipe 13. having a longitudmal rectangular opening therein. and having walls 14 de )endhn from 3D the pipe around said opening,said opening being of such size that said walls can fit snugly around the upper portion of the fine r, said pipe 13 thus forming a hood. Vhen the hood is in position upon the ventilator proper. the stream of air flowing upwardly tllQlGlliULfl'Hlll said flue flows to each end of the pipe 13. Fitting around each open end of the pipe. is a ring in. to which are connected the inner edges of plates 17. of which the outer edges are Connected to a large ring 1 each end 21 of which converges conically. To the outer ends of said plates are also connected circular dislo; 2'2.

Theends of each ring 1 are spaced respectively from the adjacentopen end of' the pipe 13 and the edge of the adjacent disk 22. so that the air can freely pass therehetwm-n. lso each dish 22 has therein a large opening 23 to permit the air to pass l'ln-ri-ilu-uugh. and. in order to prevent the entrain-e of rain, sleet or, snow through said opening 23, there are secured to each disk This 22, around the opening 2; the feet ll of legs 2U secured to a protecting cover plate 27, said plate 2T being spaced from the adjacent disk 22 sutlicientlv to permit the passage of air therebetween.

It will" be seen that, with this construction the egress ot air from the flue l and pipe 13 is greatly facilitated. At the same time rain isprevented from entering the fine on aceotmt. of the protecting covers 27, and also .on a'ecount'ot' the ends of the rings 19 being conical and extendil'lg over the ends of the pipe 13'. Should, however, any rain enter either end of the hood, its progress will be arrested by a channel 28 in the ring 19, from which it can escape by holes 25) provided for that purpose, and will also be arrested by channels 30, 31, in each end of the pipe 13. t

It will thushe seen that I provide positive means for drawing off the impure air from the interior of the car, requiring no power for (iperatilng the same other than the movement of the ear itself, and said means being well adapted to exclude the entrance of rain, sleet or-snow. To provide against the entrain-e of snow through the conduit 9, I provide doors 32, which, as shown in Fig.2. may be closed when desired.

Iain aware that it has been proposed to draw air downward outof a car bv means of a rearwardly and downwardly directed,

conduit uniting with the bottom of a vertical exhaust passage, but I have found that it is essential for the best results that the rearwardtv directed conduit should be n netted at its rear end with the exhalnt pun--7 sage at a pointwhere the exhaust an" iron.- the ear is still inclosed by the Walls oi the exhaust passage. If the rearn'ardty extend ing conduit joins the exhaust passage where it eonnnunicates with the outside atmosphere, it does not have the same effect of producing an upward or downward draft, as the ease ma v be, inthe exhaust passage as when it enters said exhaust passage at an intermediate point thereof. where the exhaust air is still confined inthe passage. The reason for this is that the rearward stream of air flows across the end of the passage instead of being directed upwardly or downwardly by the walls of the passage.

I. claim In a car ventilator, the combination of a fine leading upwardly from the inside to the outside of the car, a conduit leading rearwardly from the outside of the. car to an intermediate point of the flue and cli- -rected upwardly at itsrear end, a transversely extending pipe open at both ends into which said flue discharges at the top and means for preventing, the entrance of rain or the like into said n'pe.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

THOMAS PATTISON;

Witnesses F. M. \Vmonrr, 1). B. RIcHAnns. 

